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The Sun activity increases during every ...

5 years
11 years
22 years
1300 years
Solar cycles have an average duration of about 11 years. The periodic changes in the Sun's activity include changes of the levels of solar radiation and the number and size of sunspots.
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Answers by country

5 years
11 years
22 years
1300 years
answers
flagFrance
5%
73%
10%
10%
19
flagAustria
20%
68%
2%
6%
73
flagGreece
20%
60%
5%
15%
20
flagthe Netherlands
8%
58%
25%
8%
12
flagRepublic of Ireland
16%
58%
16%
8%
12
flagGermany
13%
55%
14%
15%
402
flagPakistan
12%
54%
20%
12%
24
flagCanada
19%
52%
14%
14%
21
flagthe United Kingdom
12%
50%
19%
17%
125
flagSwitzerland
5%
50%
20%
20%
34
flagthe United States
13%
48%
19%
17%
233
flagAustralia
11%
48%
11%
23%
43
flagIndia
19%
44%
13%
21%
382
flagPoland
12%
42%
19%
25%
8034
flagthe United Arab Emirates
20%
40%
6%
33%
15
flagthe Philippines
18%
31%
21%
28%
32
flagUnknown
18%
31%
31%
18%
16

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